Some of it, and mostly not from where people look. River flooding touches only a thin slice of the town. Surface water is the bigger story. Around one postcode in eight is rated high on at least one measure. "Not in a flood zone" is true here and answers a smaller question than the one a buyer is asking.
On the Environment Agency's river-and-sea flood maps, about 4% of Aldershot's postcodes sit in Flood Zone 2 and under 1% in Flood Zone 3. The two are separate bands: Zone 3 is the higher-probability core, and Zone 2 is the medium-probability fringe beyond it, so the larger Zone 2 figure does not contain the smaller one. Either way, the rivers and the sea account for a small share of the town. The last flood the Environment Agency has on record here came from a main river in December 1968, when the channel overflowed where no raised defences stood, and it is one of four recorded events.
Surface water is where the real exposure sits. It does not appear in the river-and-sea zones at all, which is why a listing can quote the zone map honestly and still leave out the thing most likely to put water in a kitchen. Heavy rain on built-up ground with nowhere to drain does not care what flood zone the street is in.
Looking ahead, the Environment Agency's climate-adjusted flood zone covers 0% of the area on top of today's zones. On river and sea flooding, the forward look does not move the picture.
For insurance, the gap between the two measures matters. Insurers price from their own mapping, and a property that sits outside every river zone can still carry a surface-water loading. Get an indicative quote on the exact address before instructing a solicitor, because finding out after exchange changes nothing except the size of the premium.
Counting every indicator together, including surface water alongside rivers and sea, about 12% of Aldershot's postcodes rate high on at least one measure, 15% medium and 34% low. These bands overlap with the flood-zone shares above and are not added to them; they measure something broader. The zone figures say how exposed the town is to rivers. The postcode indicators say how many streets have some flood question worth asking.
The Environment Agency's rivers-and-sea mapping also counts individual properties, and only postcodes carrying some risk appear in it: 55 postcodes, holding 1,341 properties. Of those, 87 properties are at high risk, 78 of them homes, 14 at medium risk and 328 at low risk. A count of houses is the more useful figure for a buyer, because a postcode share can hide a street where every door is exposed.
On whether anything stands between the water and the house, about 1% of postcodes fall inside the high-probability flood extent with defences left out of the model, and the same 1% with defences included. A defence being present in the model is not the same as a property being safe, and here the defences make no visible difference to the high-risk extent. Nobody should read a flood defence on a map as a promise.
Aldershot is well inland, and the nearest tide gauge is at Portsmouth. That gauge recorded sea level rising at about 2 millimetres a year between 1962 and 2023. That is a measured historic rate on the south coast, not a forecast, and not a direct risk to a town this far from the sea.
Flood risk in Aldershot is middling: the rivers are a small concern, but surface water puts a real minority of streets in question, so check the address rather than the town.